qmk_firmware/tmk_core/common/action.c

/*
Copyright 2012,2013 Jun Wako <wakojun@gmail.com>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "host.h"
#include "keycode.h"
#include "keyboard.h"
#include "mousekey.h"
#include "command.h"
#include "led.h"
#include "action_layer.h"
#include "action_tapping.h"
#include "action_macro.h"
#include "action_util.h"
#include "action.h"
#include "wait.h"

#ifdef BACKLIGHT_ENABLE
#    include "backlight.h"
#endif

#ifdef DEBUG_ACTION
#    include "debug.h"
#else
#    include "nodebug.h"
#endif

int tp_buttons;

#ifdef RETRO_TAPPING
int retro_tapping_counter = 0;
#endif

#ifdef FAUXCLICKY_ENABLE
#    include <fauxclicky.h>
#endif

#ifdef IGNORE_MOD_TAP_INTERRUPT_PER_KEY
__attribute__((weak)) bool get_ignore_mod_tap_interrupt(uint16_t keycode) { return false; }
#endif

#ifndef TAP_CODE_DELAY
#    define TAP_CODE_DELAY 0
#endif
#ifndef TAP_HOLD_CAPS_DELAY
#    define TAP_HOLD_CAPS_DELAY 80
#endif
/** \brief Called to execute an action.
 *
 * FIXME: Needs documentation.
 */
void action_exec(keyevent_t event) {
    if (!IS_NOEVENT(event)) {
        dprint("\n---- action_exec: start -----\n");
        dprint("EVENT: ");
        debug_event(event);
        dprintln();
#ifdef RETRO_TAPPING
        retro_tapping_counter++;
#endif
    }

#ifdef FAUXCLICKY_ENABLE
    if (IS_PRESSED(event)) {
        FAUXCLICKY_ACTION_PRESS;
    }
    if (IS_RELEASED(event)) {
        FAUXCLICKY_ACTION_RELEASE;
    }
    fauxclicky_check();
#endif

#ifdef SWAP_HANDS_ENABLE
    if (!IS_NOEVENT(event)) {
        process_hand_swap(&event);
    }
#endif

    keyrecord_t record = {.event = event};

#if (defined(ONESHOT_TIMEOUT) && (ONESHOT_TIMEOUT > 0))
    if (has_oneshot_layer_timed_out()) {
        clear_oneshot_layer_state(ONESHOT_OTHER_KEY_PRESSED);
    }
    if (has_oneshot_mods_timed_out()) {
        clear_oneshot_mods();
    }
#endif

#ifndef NO_ACTION_TAPPING
    action_tapping_process(record);
#else
    process_record(&record);
    if (!IS_NOEVENT(record.event)) {
        dprint("processed: ");
        debug_record(record);
        dprintln();
    }
#endif
}

#ifdef SWAP_HANDS_ENABLE
bool swap_hands = false;
bool swap_held  = false;

/** \brief Process Hand Swap
 *
 * FIXME: Needs documentation.
 */
void process_hand_swap(keyevent_t *event) {
    static swap_state_row_t swap_state[MATRIX_ROWS];

    keypos_t         pos     = event->key;
    swap_state_row_t col_bit = (swap_state_row_t)1 << pos.col;
    bool             do_swap = event->pressed ? swap_hands : swap_state[pos.row] & (col_bit);

    if (do_swap) {
        event->key = hand_swap_config[pos.row][pos.col];
        swap_state[pos.row] |= col_bit;
    } else {
        swap_state[pos.row] &= ~(col_bit);
    }
}
#endif

#if !defined(NO_ACTION_LAYER) && !defined(STRICT_LAYER_RELEASE)
bool disable_action_cache = false;

void process_record_nocache(keyrecord_t *record) {
    disable_action_cache = true;
    process_record(record);
    disable_action_cache = false;
}
#else
void process_record_nocache(keyrecord_t *record) { process_record(record); }
#endif

__attribute__((weak)) bool process_record_quantum(keyrecord_t *record) { return true; }

#ifndef NO_ACTION_TAPPING
/** \brief Allows for handling tap-hold actions immediately instead of waiting for TAPPING_TERM or another keypress.
 *
 * FIXME: Needs documentation.
 */
void process_record_tap_hint(keyrecord_t *record) {
    action_t action = layer_switch_get_action(record->event.key);

    switch (action.kind.id) {
#    ifdef SWAP_HANDS_ENABLE
        case ACT_SWAP_HANDS:
            switch (action.swap.code) {
                case OP_SH_TAP_TOGGLE:
                default:
                    swap_hands = !swap_hands;
                    swap_held  = true;
            }
            break;
#    endif
    }
}
#endif

/** \brief Take a key event (key press or key release) and processes it.
 *
 * FIXME: Needs documentation.
 */
void process_record(keyrecord_t *record) {
    if (IS_NOEVENT(record->event)) {
        return;
    }

    if (!process_record_quantum(record)) return;

    action_t action = store_or_get_action(record->event.pressed, record->event.key);
    dprint("ACTION: ");
    debug_action(action);
#ifndef NO_ACTION_LAYER
    dprint(" layer_state: ");
    layer_debug();
    dprint(" default_layer_state: ");
    default_layer_debug();
#endif
    dprintln();

    process_action(record, action);
}

/** \brief Take an action and processes it.
 *
 * FIXME: Needs documentation.
 */
void process_action(keyrecord_t *record, action_t action) {
    keyevent_t event = record->event;
#ifndef NO_ACTION_TAPPING
    uint8_t tap_count = record->tap.count;
#endif

    if (event.pressed) {
        // clear the potential weak mods left by previously pressed keys
        clear_weak_mods();
    }

#ifndef NO_ACTION_ONESHOT
    bool do_release_oneshot = false;
    // notice we only clear the one shot layer if the pressed key is not a modifier.
    if (is_oneshot_layer_active() && event.pressed && !IS_MOD(action.key.code)) {
        clear_oneshot_layer_state(ONESHOT_OTHER_KEY_PRESSED);
        do_release_oneshot = !is_oneshot_layer_active();
    }
#endif

    switch (action.kind.id) {
        /* Key and Mods */
        case ACT_LMODS:
        case ACT_RMODS: {
            uint8_t mods = (action.kind.id == ACT_LMODS) ? action.key.mods : action.key.mods << 4;
            if (event.pressed) {
                if (mods) {
                    if (IS_MOD(action.key.code) || action.key.code == KC_NO) {
                        // e.g. LSFT(KC_LGUI): we don't want the LSFT to be weak as it would make it useless.
                        // This also makes LSFT(KC_LGUI) behave exactly the same as LGUI(KC_LSFT).
                        // Same applies for some keys like KC_MEH which are declared as MEH(KC_NO).
                        add_mods(mods);
                    } else {
                        add_weak_mods(mods);
                    }
                    send_keyboard_report();
                }
                register_code(action.key.code);
            } else {
                unregister_code(action.key.code);
                if (mods) {
                    if (IS_MOD(action.key.code) || action.key.code == KC_NO) {
                        del_mods(mods);
                    } else {
                        del_weak_mods(mods);
                    }
                    send_keyboard_report();
                }
            }
        } break;
#ifndef NO_ACTION_TAPPING
        case ACT_LMODS_TAP:
        case ACT_RMODS_TAP: {
            uint8_t mods = (action.kind.id == ACT_LMODS_TAP) ? action.key.mods : action.key.mods << 4;
            switch (action.layer_tap.code) {
#    ifndef NO_ACTION_ONESHOT
                case MODS_ONESHOT:
                    // Oneshot modifier
                    if (event.pressed) {
                        if (tap_count == 0) {
                            dprint("MODS_TAP: Oneshot: 0\n");
                            register_mods(mods | get_oneshot_mods());
                        } else if (tap_count == 1) {
                            dprint("MODS_TAP: Oneshot: start\n");
                            set_oneshot_mods(mods | get_oneshot_mods());
#        if defined(ONESHOT_TAP_TOGGLE) && ONESHOT_TAP_TOGGLE > 1
                        } else if (tap_count == ONESHOT_TAP_TOGGLE) {
                            dprint("MODS_TAP: Toggling oneshot");
                            clear_oneshot_mods();
                            set_oneshot_locked_mods(mods);
                            register_mods(mods);
#        endif
                        } else {
                            register_mods(mods | get_oneshot_mods());
                        }
                    } else {
                        if (tap_count == 0) {
                            clear_oneshot_mods();
                            unregister_mods(mods);
                        } else if (tap_count == 1) {
                            // Retain Oneshot mods
#        if defined(ONESHOT_TAP_TOGGLE) && ONESHOT_TAP_TOGGLE > 1
                            if (mods & get_mods()) {
                                clear_oneshot_locked_mods();
                                clear_oneshot_mods();
                                unregister_mods(mods);
                            }
                        } else if (tap_count == ONESHOT_TAP_TOGGLE) {
                            // Toggle Oneshot Layer
#        endif
                        } else {
                            clear_oneshot_mods();
                            unregister_mods(mods);
                        }
                    }
                    break;
#    endif
                case MODS_TAP_TOGGLE:
                    if (event.pressed) {
                        if (tap_count <= TAPPING_TOGGLE) {
                            register_mods(mods);
                        }
                    } else {
                        if (tap_count < TAPPING_TOGGLE) {
                            unregister_mods(mods);
                        }
                    }
                    break;
                default:
                    if (event.pressed) {
                        if (tap_count > 0) {
#    if !defined(IGNORE_MOD_TAP_INTERRUPT) || defined(IGNORE_MOD_TAP_INTERRUPT_PER_KEY)
                            if (
#        ifdef IGNORE_MOD_TAP_INTERRUPT_PER_KEY
                                !get_ignore_mod_tap_interrupt(get_event_keycode(record->event)) &&
#        endif
                                record->tap.interrupted) {
                                dprint("mods_tap: tap: cancel: add_mods\n");
                                // ad hoc: set 0 to cancel tap
                                record->tap.count = 0;
                                register_mods(mods);
                            } else
#    endif
                            {
                                dprint("MODS_TAP: Tap: register_code\n");
                                register_code(action.key.code);
                            }
                        } else {
                            dprint("MODS_TAP: No tap: add_mods\n");
                            register_mods(mods);
                        }
                    } else {
                        if (tap_count > 0) {
                            dprint("MODS_TAP: Tap: unregister_code\n");
                            if (action.layer_tap.code == KC_CAPS) {
                                wait_ms(TAP_HOLD_CAPS_DELAY);
                            }
                            unregister_code(action.key.code);
                        } else {
                            dprint("MODS_TAP: No tap: add_mods\n");
                            unregister_mods(mods);
                        }
                    }
                    break;
            }
        } break;
#endif
#ifdef EXTRAKEY_ENABLE
        /* other HID usage */
        case ACT_USAGE:
            switch (action.usage.page) {
                case PAGE_SYSTEM:
                    if (event.pressed) {
                        host_system_send(action.usage.code);
                    } else {
                        host_system_send(0);
                    }
                    break;
                case PAGE_CONSUMER:
                    if (event.pressed) {
                        host_consumer_send(action.usage.code);
                    } else {
                        host_consumer_send(0);
                    }
                    break;
            }
            break;
#endif
#ifdef MOUSEKEY_ENABLE
        /* Mouse key */
        case ACT_MOUSEKEY:
            if (event.pressed) {
                switch (action.key.code) {
                    case KC_MS_BTN1:
                        tp_buttons |= (1 << 0);
                        break;
                    case KC_MS_BTN2:
                        tp_buttons |= (1 << 1);
                        break;
                    case KC_MS_BTN3:
                        tp_buttons |= (1 << 2);
                        break;
                    default:
                        break;
                }
                mousekey_on(action.key.code);
                mousekey_send();
            } else {
                switch (action.key.code) {
                    case KC_MS_BTN1:
                        tp_buttons &= ~(1 << 0);
                        break;
                    case KC_MS_BTN2:
                        tp_buttons &= ~(1 << 1);
                        break;
                    case KC_MS_BTN3:
                        tp_buttons &= ~(1 << 2);
                        break;
                    default:
                        break;
                }
                mousekey_off(action.key.code);
                mousekey_send();
            }
            break;
#endif
#ifndef NO_ACTION_LAYER
        case ACT_LAYER:
            if (action.layer_bitop.on == 0) {
                /* Default Layer Bitwise Operation */
                if (!event.pressed) {
                    uint8_t       shift = action.layer_bitop.part * 4;
                    layer_state_t bits  = ((layer_state_t)action.layer_bitop.bits) << shift;
                    layer_state_t mask  = (action.layer_bitop.xbit) ? ~(((layer_state_t)0xf) << shift) : 0;
                    switch (action.layer_bitop.op) {
                        case OP_BIT_AND:
                            default_layer_and(bits | mask);
                            break;
                        case OP_BIT_OR:
                            default_layer_or(bits | mask);
                            break;
                        case OP_BIT_XOR:
                            default_layer_xor(bits | mask);
                            break;
                        case OP_BIT_SET:
                            default_layer_set(bits | mask);
                            break;
                    }
                }
            } else {
                /* Layer Bitwise Operation */
                if (event.pressed ? (action.layer_bitop.on & ON_PRESS) : (action.layer_bitop.on & ON_RELEASE)) {
                    uint8_t       shift = action.layer_bitop.part * 4;
                    layer_state_t bits  = ((layer_state_t)action.layer_bitop.bits) << shift;
                    layer_state_t mask  = (action.layer_bitop.xbit) ? ~(((layer_state_t)0xf) << shift) : 0;
                    switch (action.layer_bitop.op) {
                        case OP_BIT_AND:
                            layer_and(bits | mask);
                            break;
                        case OP_BIT_OR:
                            layer_or(bits | mask);
                            break;
                        case OP_BIT_XOR:
                            layer_xor(bits | mask);
                            break;
                        case OP_BIT_SET:
                            layer_state_set(bits | mask);
                            break;
                    }
                }
            }
            break;
        case ACT_LAYER_MODS:
            if (event.pressed) {
                layer_on(action.layer_mods.layer);
                register_mods(action.layer_mods.mods);
            } else {
                unregister_mods(action.layer_mods.mods);
                layer_off(action.layer_mods.layer);
            }
            break;
#    ifndef NO_ACTION_TAPPING
        case ACT_LAYER_TAP:
        case ACT_LAYER_TAP_EXT:
            switch (action.layer_tap.code) {
                case OP_TAP_TOGGLE:
                    /* tap toggle */
                    if (event.pressed) {
                        if (tap_count < TAPPING_TOGGLE) {
                            layer_invert(action.layer_tap.val);
                        }
                    } else {
                        if (tap_count <= TAPPING_TOGGLE) {
                            layer_invert(action.layer_tap.val);
                        }
                    }
                    break;
                case OP_ON_OFF:
                    event.pressed ? layer_on(action.layer_tap.val) : layer_off(action.layer_tap.val);
                    break;
                case OP_OFF_ON:
                    event.pressed ? layer_off(action.layer_tap.val) : layer_on(action.layer_tap.val);
                    break;
                case OP_SET_CLEAR:
                    event.pressed ? layer_move(action.layer_tap.val) : layer_clear();
                    break;
#        ifndef NO_ACTION_ONESHOT
                case OP_ONESHOT:
                    // Oneshot modifier
#            if defined(ONESHOT_TAP_TOGGLE) && ONESHOT_TAP_TOGGLE > 1
                    do_release_oneshot = false;
                    if (event.pressed) {
                        del_mods(get_oneshot_locked_mods());
                        if (get_oneshot_layer_state() == ONESHOT_TOGGLED) {
                            reset_oneshot_layer();
                            layer_off(action.layer_tap.val);
                            break;
                        } else if (tap_count < ONESHOT_TAP_TOGGLE) {
                            layer_on(action.layer_tap.val);
                            set_oneshot_layer(action.layer_tap.val, ONESHOT_START);
                        }
                    } else {
                        add_mods(get_oneshot_locked_mods());
                        if (tap_count >= ONESHOT_TAP_TOGGLE) {
                            reset_oneshot_layer();
                            clear_oneshot_locked_mods();
                            set_oneshot_layer(action.layer_tap.val, ONESHOT_TOGGLED);
                        } else {
                            clear_oneshot_layer_state(ONESHOT_PRESSED);
                        }
                    }
#            else
                    if (event.pressed) {
                        layer_on(action.layer_tap.val);
                        set_oneshot_layer(action.layer_tap.val, ONESHOT_START);
                    } else {
                        clear_oneshot_layer_state(ONESHOT_PRESSED);
                        if (tap_count > 1) {
                            clear_oneshot_layer_state(ONESHOT_OTHER_KEY_PRESSED);
                        }
                    }
#            endif
                    break;
#        endif
                default:
                    /* tap key */
                    if (event.pressed) {
                        if (tap_count > 0) {
                            dprint("KEYMAP_TAP_KEY: Tap: register_code\n");
                            register_code(action.layer_tap.code);
                        } else {
                            dprint("KEYMAP_TAP_KEY: No tap: On on press\n");
                            layer_on(action.layer_tap.val);
                        }
                    } else {
                        if (tap_count > 0) {
                            dprint("KEYMAP_TAP_KEY: Tap: unregister_code\n");
                            if (action.layer_tap.code == KC_CAPS) {
                                wait_ms(TAP_HOLD_CAPS_DELAY);
                            } else {
                                wait_ms(TAP_CODE_DELAY);
                            }
                            unregister_code(action.layer_tap.code);
                        } else {
                            dprint("KEYMAP_TAP_KEY: No tap: Off on release\n");
                            layer_off(action.layer_tap.val);
                        }
                    }
                    break;
            }
            break;
#    endif
#endif
            /* Extentions */
#ifndef NO_ACTION_MACRO
        case ACT_MACRO:
            action_macro_play(action_get_macro(record, action.func.id, action.func.opt));
            break;
#endif
#if defined(BACKLIGHT_ENABLE) || defined(LED_MATRIX_ENABLE)
        case ACT_BACKLIGHT:
            if (!event.pressed) {
                switch (action.backlight.opt) {
                    case BACKLIGHT_INCREASE:
                        backlight_increase();
                        break;
                    case BACKLIGHT_DECREASE:
                        backlight_decrease();
                        break;
                    case BACKLIGHT_TOGGLE:
                        backlight_toggle();
                        break;
                    case BACKLIGHT_STEP:
                        backlight_step();
                        break;
                    case BACKLIGHT_ON:
                        backlight_level(BACKLIGHT_LEVELS);
                        break;
                    case BACKLIGHT_OFF:
                        backlight_level(0);
                        break;
                }
            }
            break;
#endif
        case ACT_COMMAND:
            break;
#ifdef SWAP_HANDS_ENABLE
        case ACT_SWAP_HANDS:
            switch (action.swap.code) {
                case OP_SH_TOGGLE:
                    if (event.pressed) {
                        swap_hands = !swap_hands;
                    }
                    break;
                case OP_SH_ON_OFF:
                    swap_hands = event.pressed;
                    break;
                case OP_SH_OFF_ON:
                    swap_hands = !event.pressed;
                    break;
                case OP_SH_ON:
                    if (!event.pressed) {
                        swap_hands = true;
                    }
                    break;
                case OP_SH_OFF:
                    if (!event.pressed) {
                        swap_hands = false;
                    }
                    break;
#    ifndef NO_ACTION_TAPPING
                case OP_SH_TAP_TOGGLE:
                    /* tap toggle */

                    if (event.pressed) {
                        if (swap_held) {
                            swap_held = false;
                        } else {
                            swap_hands = !swap_hands;
                        }
                    } else {
                        if (tap_count < TAPPING_TOGGLE) {
                            swap_hands = !swap_hands;
                        }
                    }
                    break;
                default:
                    /* tap key */
                    if (tap_count > 0) {
                        if (swap_held) {
                            swap_hands = !swap_hands;  // undo hold set up in _tap_hint
                            swap_held  = false;
                        }
                        if (event.pressed) {
                            register_code(action.swap.code);
                        } else {
                            wait_ms(TAP_CODE_DELAY);
                            unregister_code(action.swap.code);
                            *record = (keyrecord_t){};  // hack: reset tap mode
                        }
                    } else {
                        if (swap_held && !event.pressed) {
                            swap_hands = !swap_hands;  // undo hold set up in _tap_hint
                            swap_held  = false;
                        }
                    }
#    endif
            }
#endif
#ifndef NO_ACTION_FUNCTION
        case ACT_FUNCTION:
            action_function(record, action.func.id, action.func.opt);
            break;
#endif
        default:
            break;
    }

#ifndef NO_ACTION_LAYER
    // if this event is a layer action, update the leds
    switch (action.kind.id) {
        case ACT_LAYER:
        case ACT_LAYER_MODS:
#    ifndef NO_ACTION_TAPPING
        case ACT_LAYER_TAP:
        case ACT_LAYER_TAP_EXT:
#    endif
            led_set(host_keyboard_leds());
            break;
        default:
            break;
    }
#endif

#ifndef NO_ACTION_TAPPING
#    ifdef RETRO_TAPPING
    if (!is_tap_action(action)) {
        retro_tapping_counter = 0;
    } else {
        if (event.pressed) {
            if (tap_count > 0) {
                retro_tapping_counter = 0;
            } else {
            }
        } else {
            if (tap_count > 0) {
                retro_tapping_counter = 0;
            } else {
                if (retro_tapping_counter == 2) {
                    tap_code(action.layer_tap.code);
                }
                retro_tapping_counter = 0;
            }
        }
    }
#    endif
#endif

#ifndef NO_ACTION_ONESHOT
    /* Because we switch layers after a oneshot event, we need to release the
     * key before we leave the layer or no key up event will be generated.
     */
    if (do_release_oneshot && !(get_oneshot_layer_state() & ONESHOT_PRESSED)) {
        record->event.pressed = false;
        layer_on(get_oneshot_layer());
        process_record(record);
        layer_off(get_oneshot_layer());
    }
#endif
}

/** \brief Utilities for actions. (FIXME: Needs better description)
 *
 * FIXME: Needs documentation.
 */
void register_code(uint8_t code) {
    if (code == KC_NO) {
        return;
    }
#ifdef LOCKING_SUPPORT_ENABLE
    else if (KC_LOCKING_CAPS == code) {
#    ifdef LOCKING_RESYNC_ENABLE
        // Resync: ignore if caps lock already is on
        if (host_keyboard_leds() & (1 << USB_LED_CAPS_LOCK)) return;
#    endif
        add_key(KC_CAPSLOCK);
        send_keyboard_report();
        wait_ms(100);
        del_key(KC_CAPSLOCK);
        send_keyboard_report();
    }

    else if (KC_LOCKING_NUM == code) {
#    ifdef LOCKING_RESYNC_ENABLE
        if (host_keyboard_leds() & (1 << USB_LED_NUM_LOCK)) return;
#    endif
        add_key(KC_NUMLOCK);
        send_keyboard_report();
        wait_ms(100);
        del_key(KC_NUMLOCK);
        send_keyboard_report();
    }

    else if (KC_LOCKING_SCROLL == code) {
#    ifdef LOCKING_RESYNC_ENABLE
        if (host_keyboard_leds() & (1 << USB_LED_SCROLL_LOCK)) return;
#    endif
        add_key(KC_SCROLLLOCK);
        send_keyboard_report();
        wait_ms(100);
        del_key(KC_SCROLLLOCK);
        send_keyboard_report();
    }
#endif

    else if
        IS_KEY(code) {
            // TODO: should push command_proc out of this block?
            if (command_proc(code)) return;

#ifndef NO_ACTION_ONESHOT
/* TODO: remove
        if (oneshot_state.mods && !oneshot_state.disabled) {
            uint8_t tmp_mods = get_mods();
            add_mods(oneshot_state.mods);

            add_key(code);
            send_keyboard_report();

            set_mods(tmp_mods);
            send_keyboard_report();
            oneshot_cancel();
        } else
*/
#endif
            {
                add_key(code);
                send_keyboard_report();
            }
        }
    else if
        IS_MOD(code) {
            add_mods(MOD_BIT(code));
            send_keyboard_report();
        }
    else if
        IS_SYSTEM(code) { host_system_send(KEYCODE2SYSTEM(code)); }
    else if
        IS_CONSUMER(code) { host_consumer_send(KEYCODE2CONSUMER(code)); }

#ifdef MOUSEKEY_ENABLE
    else if
        IS_MOUSEKEY(code) {
            mousekey_on(code);
            mousekey_send();
        }
#endif
}

/** \brief Utilities for actions. (FIXME: Needs better description)
 *
 * FIXME: Needs documentation.
 */
void unregister_code(uint8_t code) {
    if (code == KC_NO) {
        return;
    }
#ifdef LOCKING_SUPPORT_ENABLE
    else if (KC_LOCKING_CAPS == code) {
#    ifdef LOCKING_RESYNC_ENABLE
        // Resync: ignore if caps lock already is off
        if (!(host_keyboard_leds() & (1 << USB_LED_CAPS_LOCK))) return;
#    endif
        add_key(KC_CAPSLOCK);
        send_keyboard_report();
        del_key(KC_CAPSLOCK);
        send_keyboard_report();
    }

    else if (KC_LOCKING_NUM == code) {
#    ifdef LOCKING_RESYNC_ENABLE
        if (!(host_keyboard_leds() & (1 << USB_LED_NUM_LOCK))) return;
#    endif
        add_key(KC_NUMLOCK);
        send_keyboard_report();
        del_key(KC_NUMLOCK);
        send_keyboard_report();
    }

    else if (KC_LOCKING_SCROLL == code) {
#    ifdef LOCKING_RESYNC_ENABLE
        if (!(host_keyboard_leds() & (1 << USB_LED_SCROLL_LOCK))) return;
#    endif
        add_key(KC_SCROLLLOCK);
        send_keyboard_report();
        del_key(KC_SCROLLLOCK);
        send_keyboard_report();
    }
#endif

    else if
        IS_KEY(code) {
            del_key(code);
            send_keyboard_report();
        }
    else if
        IS_MOD(code) {
            del_mods(MOD_BIT(code));
            send_keyboard_report();
        }
    else if
        IS_SYSTEM(code) { host_system_send(0); }
    else if
        IS_CONSUMER(code) { host_consumer_send(0); }
#ifdef MOUSEKEY_ENABLE
    else if
        IS_MOUSEKEY(code) {
            mousekey_off(code);
            mousekey_send();
        }
#endif
}

/** \brief Utilities for actions. (FIXME: Needs better description)
 *
 * FIXME: Needs documentation.
 */
void tap_code(uint8_t code) {
    register_code(code);
    if (code == KC_CAPS) {
        wait_ms(TAP_HOLD_CAPS_DELAY);
    } else {
        wait_ms(TAP_CODE_DELAY);
    }
    unregister_code(code);
}

/** \brief Adds the given physically pressed modifiers and sends a keyboard report immediately.
 *
 * \param mods A bitfield of modifiers to unregister.
 */
void register_mods(uint8_t mods) {
    if (mods) {
        add_mods(mods);
        send_keyboard_report();
    }
}

/** \brief Removes the given physically pressed modifiers and sends a keyboard report immediately.
 *
 * \param mods A bitfield of modifiers to unregister.
 */
void unregister_mods(uint8_t mods) {
    if (mods) {
        del_mods(mods);
        send_keyboard_report();
    }
}

/** \brief Adds the given weak modifiers and sends a keyboard report immediately.
 *
 * \param mods A bitfield of modifiers to register.
 */
void register_weak_mods(uint8_t mods) {
    if (mods) {
        add_weak_mods(mods);
        send_keyboard_report();
    }
}

/** \brief Removes the given weak modifiers and sends a keyboard report immediately.
 *
 * \param mods A bitfield of modifiers to unregister.
 */
void unregister_weak_mods(uint8_t mods) {
    if (mods) {
        del_weak_mods(mods);
        send_keyboard_report();
    }
}

/** \brief Utilities for actions. (FIXME: Needs better description)
 *
 * FIXME: Needs documentation.
 */
void clear_keyboard(void) {
    clear_mods();
    clear_keyboard_but_mods();
}

/** \brief Utilities for actions. (FIXME: Needs better description)
 *
 * FIXME: Needs documentation.
 */
void clear_keyboard_but_mods(void) {
    clear_keys();
    clear_keyboard_but_mods_and_keys();
}

/** \brief Utilities for actions. (FIXME: Needs better description)
 *
 * FIXME: Needs documentation.
 */
void clear_keyboard_but_mods_and_keys() {
    clear_weak_mods();
    clear_macro_mods();
    send_keyboard_report();
#ifdef MOUSEKEY_ENABLE
    mousekey_clear();
    mousekey_send();
#endif
#ifdef EXTRAKEY_ENABLE
    host_system_send(0);
    host_consumer_send(0);
#endif
}

/** \brief Utilities for actions. (FIXME: Needs better description)
 *
 * FIXME: Needs documentation.
 */
bool is_tap_key(keypos_t key) {
    action_t action = layer_switch_get_action(key);
    return is_tap_action(action);
}

/** \brief Utilities for actions. (FIXME: Needs better description)
 *
 * FIXME: Needs documentation.
 */
bool is_tap_action(action_t action) {
    switch (action.kind.id) {
        case ACT_LMODS_TAP:
        case ACT_RMODS_TAP:
        case ACT_LAYER_TAP:
        case ACT_LAYER_TAP_EXT:
            switch (action.layer_tap.code) {
                case KC_NO ... KC_RGUI:
                case OP_TAP_TOGGLE:
                case OP_ONESHOT:
                    return true;
            }
            return false;
        case ACT_SWAP_HANDS:
            switch (action.swap.code) {
                case KC_NO ... KC_RGUI:
                case OP_SH_TAP_TOGGLE:
                    return true;
            }
            return false;
        case ACT_MACRO:
        case ACT_FUNCTION:
            if (action.func.opt & FUNC_TAP) {
                return true;
            }
            return false;
    }
    return false;
}

/** \brief Debug print (FIXME: Needs better description)
 *
 * FIXME: Needs documentation.
 */
void debug_event(keyevent_t event) { dprintf("%04X%c(%u)", (event.key.row << 8 | event.key.col), (event.pressed ? 'd' : 'u'), event.time); }

/** \brief Debug print (FIXME: Needs better description)
 *
 * FIXME: Needs documentation.
 */
void debug_record(keyrecord_t record) {
    debug_event(record.event);
#ifndef NO_ACTION_TAPPING
    dprintf(":%u%c", record.tap.count, (record.tap.interrupted ? '-' : ' '));
#endif
}

/** \brief Debug print (FIXME: Needs better description)
 *
 * FIXME: Needs documentation.
 */
void debug_action(action_t action) {
    switch (action.kind.id) {
        case ACT_LMODS:
            dprint("ACT_LMODS");
            break;
        case ACT_RMODS:
            dprint("ACT_RMODS");
            break;
        case ACT_LMODS_TAP:
            dprint("ACT_LMODS_TAP");
            break;
        case ACT_RMODS_TAP:
            dprint("ACT_RMODS_TAP");
            break;
        case ACT_USAGE:
            dprint("ACT_USAGE");
            break;
        case ACT_MOUSEKEY:
            dprint("ACT_MOUSEKEY");
            break;
        case ACT_LAYER:
            dprint("ACT_LAYER");
            break;
        case ACT_LAYER_MODS:
            dprint("ACT_LAYER_MODS");
            break;
        case ACT_LAYER_TAP:
            dprint("ACT_LAYER_TAP");
            break;
        case ACT_LAYER_TAP_EXT:
            dprint("ACT_LAYER_TAP_EXT");
            break;
        case ACT_MACRO:
            dprint("ACT_MACRO");
            break;
        case ACT_COMMAND:
            dprint("ACT_COMMAND");
            break;
        case ACT_FUNCTION:
            dprint("ACT_FUNCTION");
            break;
        case ACT_SWAP_HANDS:
            dprint("ACT_SWAP_HANDS");
            break;
        default:
            dprint("UNKNOWN");
            break;
    }
    dprintf("[%X:%02X]", action.kind.param >> 8, action.kind.param & 0xff);
}